Composite stringer forming die and forming method

Abstract

The present application relates to the technical field of composite stringer forming, and specifically discloses a composite stringer forming die and a forming method, which comprise a die press, a jacking cavity, a clamping cavity, a positioning mechanism, a die pressing mechanism and a jacking mechanism, the inner cavity bottom end of the die press is provided with the jacking cavity, the left and right sides of the die press are both provided with the clamping cavity which is in communication with the inner cavity of the die press, the positioning mechanism is arranged in the inner cavity of the clamping cavity, the die pressing mechanism is arranged at the inner cavity top end of the die press, and the jacking mechanism is arranged in the inner cavity of the jacking cavity. The device can effectively solve the defects of edge fiber distortion and interlayer slip caused by the difference between resin flow and thermal expansion coefficient in the prior art, and can ensure that the pre-impregnated material maintains the designed angle when the pre-impregnated material is laid, and can timely identify and adjust the abnormal stress state during demolding, thereby greatly reducing the waste rate. The die system can realize precise control of the hot pressing forming process and safety protection of the demolding process, and has significant economic benefits and application value.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of composite stringer forming, in particular to a composite stringer forming die and a forming method. BACKGROUND

[0002] As a kind of high-performance structural parts, composite stringers have been widely used in aerospace, rail transportation and other fields due to their excellent specific strength and specific stiffness characteristics. Such components are usually made of carbon fiber, glass fiber and other reinforcing materials and epoxy resin, bismaleimide and other thermosetting resin matrix through a molding process. In the molding process, the prepreg lay-up is placed between the upper and lower molds, and the resin is melted and flows through heating and pressing, and is finally cured and formed. However, there are still some key technical problems in the hot pressing and demolding process of the existing composite stringer forming die, which seriously affect the forming quality and production efficiency of the parts.

[0003] During the hot pressing forming stage, the mold needs to heat the composite material to promote the curing of the resin. During this process, when the mold temperature rises to the resin melting temperature range, the thermosetting resin that has not completely cured will be in a low-viscosity flow state. Due to the significant difference in coefficient of thermal expansion (CTE) between the resin and the reinforcing fibers (the CTE of the resin is usually 50-100 ppm / °C, while the axial CTE of carbon fiber is close to 0 ppm / °C), a significant thermal mismatch effect will occur during the heating process. This effect can cause two problems: on the one hand, the transverse flow of the resin will generate shear stress between the fiber layers; on the other hand, the thermal expansion of the resin will be constrained by the fiber network, resulting in additional shear stress at the interlaminar interface. Especially in the edge area of the component, due to the lack of sufficient constraint, this stress concentration effect is more pronounced, which can easily cause edge fiber distortion, interlaminar slip and other defects, seriously affecting the dimensional accuracy and mechanical properties of the parts.

[0004] During the demolding stage, due to the inherent high brittleness of thermosetting composites and the possible problems of mold adhesion and fiber jamming during the curing process, there is a high risk in the demolding process. The existing mold system generally lacks real-time force monitoring function and cannot timely sense abnormal stress conditions during the demolding process. When local mold adhesion or fiber jamming occurs, the jacking system will continue to apply force, which can easily cause micro-cracks in the part or cause fiber breakage. More seriously, due to the uneven force distribution of the multi-jack system, this uncontrollable jacking process can also cause overall deformation or local damage of the part. These problems not only increase the scrap rate, but also significantly increase the subsequent repair cost, especially for high-value components in the aerospace field, the economic loss is more significant. SUMMARY

[0005] The composite stringer forming die and forming method can realize real-time monitoring of the demolding jacking force, and can prevent edge fiber twisting and interlayer slippage.

[0006] To achieve the above object, the present application provides the following technical scheme: a composite stringer forming die and forming method, comprising: a molding machine, a jacking cavity, a clamping cavity, a positioning mechanism, a molding mechanism and a jacking mechanism, the inner cavity bottom end of the molding machine is provided with a jacking cavity, the left and right sides of the molding machine are provided with clamping cavities which are in communication with the inner cavity thereof, the positioning mechanism is arranged in the inner cavity of the clamping cavity, the molding mechanism is arranged at the inner cavity top end of the molding machine, and the jacking mechanism is arranged in the inner cavity of the jacking cavity.

[0007] The molding mechanism comprises: third guide rods, a positioning plate, extrusion grooves, a clamping assembly, fourth guide rods, an upper die, a pre-pressing assembly and a full-pressing assembly, the number of the third guide rods is four, the upper and lower ends of the four third guide rods are arranged at the upper and lower sides of the four corners of the inner cavity of the molding machine, the four corners of the positioning plate are slidably and adaptively sleeved on the outer wall top end of the four third guide rods, the left and right sides of the positioning plate are provided with a plurality of extrusion grooves, the clamping assembly is arranged in the inner cavity of the extrusion groove, the position of the positioning plate can be fixed by cooperation of the clamping assembly and the positioning mechanism, the number of the fourth guide rods is a plurality, the outer wall top end of the plurality of fourth guide rods is slidably and adaptively inserted into the left and right sides of the positioning plate, the left and right sides of the top end of the upper die are arranged at the bottom end of the plurality of fourth guide rods, the top end of the upper die is provided with a plurality of receiving holes, the pre-pressing assembly is slidably sleeved on the outer wall of the fourth guide rod, and the full-pressing assembly is slidably sleeved on the outer wall of the fourth guide rod.

[0008] Preferably, the clamping assembly comprises: a first spring and a second clamping block, the first spring is embedded in the inner cavity of the extrusion groove, one end of the first spring is clamped to the inner wall of the extrusion groove, a part of the second clamping block is slidably embedded in the inner cavity of the extrusion groove, another part of the second clamping block is slidably extended out of the inner cavity of the extrusion groove, and the other end of the first spring is clamped to the outer wall of the second clamping block.

[0009] Preferably, the pre-pressing assembly comprises: a pressure sensor, a pressing piece and a second spring, the number of the pressure sensor is a plurality, the plurality of pressure sensors are arranged at the left and right sides of the bottom end of the positioning plate, the pressure sensor is slidably sleeved on the outer wall of the fourth guide rod, the pressing piece is slidably sleeved on the outer wall of the fourth guide rod, the top end of the pressing piece is in contact with the bottom end of the pressure sensor, the second spring is sleeved on the outer wall of the fourth guide rod, one end of the second spring is clamped to the outer wall of the fourth guide rod, and the other end of the second spring is clamped to the bottom end of the pressing piece.

[0010] Preferably, the full-press assembly comprises: a first hydraulic cylinder, a pressing plate, a sealing rod, a sleeve, a first electromagnet, a connecting column and a second electromagnet, the first hydraulic cylinder is provided in pairs on the top of the molding machine along the left-right direction, the bottom of the first hydraulic cylinder extends into the inner cavity of the molding machine, the positioning plate is slidably sleeved on the outer wall of the first hydraulic cylinder, the left and right sides of the pressing plate are slidably sleeved on the outer wall of the fourth guide rod, the bottom of the first hydraulic cylinder is provided on the top of the pressing plate, the sealing rod is provided in pairs on the bottom of the pressing plate, the position of the sealing rod and the position of the receiving hole are one-to-one corresponding, and the outer diameter of the sealing rod and the inner diameter of the receiving hole are matched, the sleeve is provided in pairs on the bottom of the positioning plate, the first electromagnet is provided at the top of the inner cavity of the sleeve, the connecting column is provided in pairs on the top of the pressing plate, the connecting column is slidably inserted into the inner cavity of the sleeve, the second electromagnet is provided on the top of the connecting column, the second electromagnet and the first electromagnet are magnetically attracted, and the second electromagnet and the first electromagnet are electrically connected with the pressure sensor.

[0011] Preferably, the positioning mechanism comprises: a first guide rod, a sliding plate, a first clamping block, a driving rod, a support and a lifting assembly, the first guide rod is provided in eight, the left and right ends of the eight first guide rods are provided on the inner cavity left and right sides of the four corners of the two clamping cavities, the sliding plate is provided in two, the four corners of the two sliding plates are slidably sleeved on the inner side of the outer wall of the eight first guide rods, the front side of the sliding plate is provided with a plurality of front and rear penetrating driving grooves in the inclined direction from top to bottom, the first clamping block is provided in a plurality, the first clamping block is provided on the inner side of the two sliding plates in the up-down direction, the first clamping block is slidably extended into the inner cavity of the molding machine, the second clamping block is matched with the first clamping block, the outer wall of the driving rod is slidably inserted into the inner cavity of the driving groove, the left and right ends of the driving rod are provided in the inner cavity left and right sides of the support in the up-down direction, and the lifting assembly is provided in the inner cavity bottom of the clamping cavity. The lifting assembly can drive the support to move up and down.

[0012] Preferably, the jacking mechanism comprises: positioning cylinders, support rods, jacking plates, rotating rods, gears, second hydraulic cylinders, lower molds, jacking holes and jacking positioning assemblies, the number of the positioning cylinders is two, the two positioning cylinders are respectively arranged on the left and right sides of the bottom end of the inner cavity of the jacking cavity, the support rods are slidably and telescopically connected to the inner cavities of the positioning cylinders, the top ends of the support rods are slidably and telescopically extended out of the top ends of the positioning cylinders, the bottom ends of the jacking plates are respectively arranged on the top ends of the two support rods, the rotating rods are rotatably arranged on the bottom end of the inner cavity of the jacking cavity through bearings, the number of the gears is two, the two gears are respectively sleeved on the left and right sides of the outer walls of the rotating rods and locked through top screws, the two gears are respectively engaged with the two support rods, the second hydraulic cylinders are arranged in the middle of the bottom end of the inner cavity of the jacking cavity, the top ends of the second hydraulic cylinders are arranged in the middle of the bottom end of the jacking plates, the lower molds are arranged on the bottom end of the inner cavity of the molding machine, the positions of the lower molds correspond to and match the positions of the upper molds, the top end of the lower mold is provided with a plurality of jacking holes penetrating up and down, the positions of the jacking holes correspond to the positions of the receiving holes one by one and the inner diameters are the same, the jacking plates are slidably and telescopically connected to the inner cavities of the lower molds, and the jacking positioning assemblies are arranged in the inner cavities of the jacking plates.

[0013] Preferably, the jacking positioning assembly comprises: positioning needles, third springs, induction blocks, support frames, first infrared sensors, second infrared sensors, first infrared receivers and second infrared receivers, the number of the positioning needles is several, the several positioning needles are equally divided into several groups, the several groups of the positioning needles are equally spaced in the left-right direction and arranged in the inner cavity of the jacking plate, the several positioning needles in each group are equally spaced in the front-rear direction and arranged in the inner cavity of the jacking plate, the positions of the several positioning needles correspond to the positions of the several jacking holes one by one, the top ends of the positioning needles can slide out of the top end of the jacking plate, the top ends of the positioning needles can slide through the inner cavity of the jacking hole and extend out of the top end of the lower mold, the outer diameter of the positioning needle is the same as the outer diameter of the plugging rod, the third spring is sleeved on the outer wall of the positioning needle, the bottom end of the third spring is clamped on the outer wall of the positioning needle, the top end of the third spring is clamped on the inner cavity top end of the jacking plate, the induction block is arranged at the bottom end of the positioning needle, the support frame is arranged at the inner cavity top end of the jacking plate, the several positioning needles are located in the inner cavity of the support frame, the number of the first infrared sensors is several, the several first infrared sensors are equally spaced in the left-right direction and arranged on the front side of the inner cavity of the support frame, the positions of the several first infrared sensors correspond to the positions of the several groups of the positioning needles one by one, the positions of the first infrared sensors are below the induction blocks, the number of the first infrared receivers is several, the several first infrared receivers are equally spaced in the left-right direction and arranged on the rear side of the inner cavity of the support frame, the positions of the several first infrared receivers correspond to and match the positions of the several first infrared sensors, the number of the second infrared sensors is several, the several second infrared sensors are equally spaced in the front-rear direction and arranged on the right side of the inner cavity of the support frame, the positions of the several second infrared sensors correspond to the positions of the several positioning needles in each group one by one, the positions of the second infrared sensors are below the induction blocks, the number of the second infrared receivers is several, the several second infrared receivers are equally spaced in the front-rear direction and arranged on the left side of the inner cavity of the support frame, the positions of the several second infrared receivers correspond to and match the positions of the several second infrared sensors.

[0014] The composite long string forming die and the forming method have the beneficial effects that:

[0015] 1. The present invention can physically limit the position of the fibers of the multiple layers of prepreg laid on the lower mold through the positioning needle. The upper and lower layers of fibers are aligned through the common positioning needle hole to avoid misalignment between layers and ensure that they maintain the designed angle. The upper mold can be used to pre-press the prepreg on the lower mold, and the second spring can be used to maintain the pressure of the upper mold to ensure that the pressure applied by the upper mold on the prepreg is constant. During the low-pressure pre-pressing stage, the fiber layer is initially fixed, the resin slowly infiltrates the fiber, the lateral flow shear force is reduced, the resin viscosity decreases with the temperature gradient, and the flow stress is slowly released. At the same time, the positioning needle is used to position the fiber layer, thereby preventing defects such as edge fiber distortion and interlayer slippage.

[0016] 2. After the pre-pressing is completed, the present invention causes the positioning pin to retract into the inner cavity of the lifting hole, and pressurizes the upper mold through the first hydraulic cylinder and the pressure plate, so that the upper mold can fully press the multi-layer prepreg laid on the lower mold and heat it, so as to cause the thermosetting resin of the multi-layer prepreg laid on the lower mold to solidify and be compression molded.

[0017] 3. After the composite material long stringer is molded, the present invention uses a lifting plate to drive the positioning pin to move upward, so that the positioning pin can be used to lift and demold the formed composite material long stringer. If the formed composite material long stringer has problems such as mold adhesion and fiber jamming, the positioning pin at that location will be squeezed to move into the inner cavity of the lifting plate, thereby driving the corresponding sensing block to move into the inner cavity of the lifting plate, and the first infrared sensor, the second infrared sensor, the first infrared receiver and the second infrared receiver are used to coordinate the positioning pin, so that manual intervention is required for demolding.

[0018] 4. This device can effectively solve the defects of edge fiber distortion and interlayer slippage caused by resin flow and thermal expansion coefficient differences in the existing technology, improve the dimensional accuracy and mechanical properties of the parts, and when laying prepreg, it can prompt the positioning needle to pass through the natural gap between the fiber bundle or the braided layer to physically limit the position of the fiber to ensure that it maintains the designed angle. At the same time, by real-time monitoring of the demolding lifting force, abnormal stress states can be identified and adjusted in time to avoid microcracks and fractures caused by mold sticking or fiber jamming, greatly reducing the scrap rate. This mold system can achieve precise control of the hot pressing process and safe protection of the demolding process. It is particularly suitable for the molding needs of high-precision, high-performance composite long stringers in aerospace and other fields, and has significant economic benefits and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is the front view of the present invention;

[0021] Figure 3 is an exploded view of the positioning mechanism;

[0022] Figure 4 is a schematic view of the structure of the positioning mechanism;

[0023] Figure 5 is an exploded view of the positioning mechanism;

[0024] Figure 6 is a schematic view of the structure of the moulding mechanism;

[0025] Figure 7 is an exploded view of the moulding mechanism;

[0026] Figure 8 is a schematic view of the structure of the sleeve;

[0027] Figure 9 is a schematic view of the structure of the jacking mechanism;

[0028] Figure 10 is an exploded view of the jacking mechanism;

[0029] Figure 11 is an enlarged view of A of Figure 7 ;

[0030] Figure 12 is an enlarged view of B of Figure 8 ;

[0031] Figure 13 is an enlarged view of C of Figure 10 ;

[0032] Figure 14 is an enlarged view of D of Figure 10 ;

[0033] Figure 15 is an enlarged view of E of Figure 10 ;

[0034] Figure 16 is an enlarged view of F of Figure 10 .

[0035] In the figure: 1, molding machine; 2, jacking cavity; 3, clamping cavity; 4, positioning mechanism; 41, first guide rod; 42, sliding plate; 43, drive groove; 44, first clamping block; 45, second guide rod; 46, bracket; 47, electric telescopic rod; 48, drive rod; 5, molding mechanism; 51, third guide rod; 52, positioning plate; 53, extrusion groove; 54, first spring; 55, second clamping block; 56, first hydraulic cylinder; 57, fourth guide rod; 58, second spring; 59, upper die; 510, storage hole; 511, pressure sensor; 512, tablet; 513, sleeve; 514, first electromagnet; 515, pressing plate; 516, connecting column; 517, second electromagnet; 518, plugging rod; 6, jacking mechanism; 61, positioning cylinder; 62, support rod; 63, jacking plate; 64, rotating rod; 65, gear; 66, second hydraulic cylinder; 67, positioning needle; 68, third spring; 69, induction block; 610, support frame; 611, first infrared sensor; 612, second infrared sensor; 613, lower die; 614, jacking hole; 615, first infrared receiver; 616, second infrared receiver. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0037] Please refer to Figures 1-16 The present application provides a composite string forming die and forming method technical scheme, which comprises: a molding machine 1, a jacking cavity 2, a clamping cavity 3, a positioning mechanism 4, a molding mechanism 5 and a jacking mechanism 6. The inner cavity bottom end of the molding machine 1 is provided with the jacking cavity 2. The left and right sides of the molding machine 1 are each provided with a clamping cavity 3 which is in communication with the inner cavity thereof. The molding machine 1 is a prior art, and will not be described in detail here. The positioning mechanism 4 is arranged in the inner cavity of the clamping cavity 3. The molding mechanism 5 is arranged at the inner cavity top end of the molding machine 1. The jacking mechanism 6 is arranged in the inner cavity of the jacking cavity 2.

[0038] As a preferred scheme, further, the moulding mechanism 5 comprises: a third guide rod 51, a positioning plate 52, a clamping assembly, a fourth guide rod 57, an upper die 59, a receiving hole 510, a pre-pressing assembly and a full-pressing assembly, the number of the third guide rod 51 is four, the upper and lower ends of the four third guide rods 51 are arranged at the upper and lower sides of the four corners of the inner cavity of the moulding machine 1 respectively, the third guide rod 51 is used for limiting the positioning plate 52, the four corners of the positioning plate 52 are slidably and adaptively sleeved on the outer wall top end of the four third guide rods 51 respectively, a plurality of extrusion grooves 53 are arranged on the left and right sides of the positioning plate 52, the positioning plate 52 is used for blocking the second spring 58, so as to stabilize the pressure of the upper die 59, the clamping assembly is arranged in the inner cavity of the extrusion groove 53, the position of the positioning plate 52 can be fixed by cooperation of the clamping assembly and the positioning mechanism 4, the number of the fourth guide rod 57 is a plurality, the outer wall top of the plurality of fourth guide rods 57 is slidably and adaptively inserted into the left and right sides of the positioning plate 52 respectively, the fourth guide rod 57 is used for connecting the positioning plate 52 and the upper die 59, the top left and right sides of the upper die 59 are arranged on the bottom end of the plurality of fourth guide rods 57 respectively, a plurality of receiving holes 510 are arranged on the top end of the upper die 59, the upper die 59 is a prior art, and will not be described here, the upper die 59 is provided with a heating device, the pre-pressing assembly is slidably sleeved on the outer wall of the fourth guide rod 57, and the full-pressing assembly is slidably sleeved on the outer wall of the fourth guide rod 57;

[0039] The clamping assembly comprises: a first spring 54 and a second clamping block 55, the first spring 54 is embedded in the inner cavity of the extrusion groove 53, one end of the first spring 54 is clamped on the inner wall of the extrusion groove 53, the first spring 54 is a rotary spring, which is elastically deformed after being extruded or stretched by external force, and returns to the initial state after the external force is removed, the first spring 54 is used for pushing the second clamping block 55 away from the inner cavity of the extrusion groove 53, a part of the second clamping block 55 is slidably embedded in the inner cavity of the extrusion groove 53, another part of the second clamping block 55 is slidably extended out of the inner cavity of the extrusion groove 53, the other end of the first spring 54 is clamped on the outer wall of the second clamping block 55;

[0040] The pre-pressing assembly comprises a pressure sensor 511, a pressing piece 512 and a second spring 58. The pressure sensor 511 is in a plurality, and the plurality of pressure sensors 511 are respectively and equally arranged on the left and right sides of the bottom end of the positioning plate 52. The pressure sensor 511 is slidably sleeved on the outer wall of the fourth guide rod 57. The pressure sensor 511 is a prior art, and will not be described here. The pressure sensor 511 is used here to monitor the pressure applied by the upper mold 59 to the prepreg. The pressing piece 512 is slidably sleeved on the outer wall of the fourth guide rod 57. The top end of the pressing piece 512 is in contact with the bottom end of the pressure sensor 511. The pressing piece 512 is used to extrude the pressure sensor 511. The second spring 58 is sleeved on the outer wall of the fourth guide rod 57. One end of the second spring 58 is clamped to the outer wall of the fourth guide rod 57. The other end of the second spring 58 is clamped to the bottom end of the pressing piece 512. The second spring 58 is a rotary spring, which is elastically deformed after being extruded or stretched by an external force, and returns to the initial state after the external force is removed. The second spring 58 is used here to increase the pressure applied by the upper mold 59 to the prepreg.

[0041] The full pressure assembly comprises: a first hydraulic cylinder 56, a pressing plate 515, a blocking rod 518, a sleeve 513, a first electromagnet 514, a connecting column 516 and a second electromagnet 517, the number of the first hydraulic cylinder 56 is several, the several first hydraulic cylinders 56 are respectively arranged equidistantly in the left-right direction at the top end of the molding machine 1, the bottom end of the first hydraulic cylinder 56 extends into the inner cavity of the molding machine 1, the positioning plate 52 is slidably sleeved on the outer wall of the first hydraulic cylinder 56, the first hydraulic cylinder 56 is a prior art, which will not be described here, the first hydraulic cylinder 56 is used here to drive the pressing plate 515 to move, the left and right sides of the pressing plate 515 are respectively slidably sleeved on the outer wall of the several fourth guide rods 57, the bottom end of the first hydraulic cylinder 56 is arranged at the top end of the pressing plate 515, the number of the blocking rod 518 is several, the several blocking rods 518 are all arranged at the bottom end of the pressing plate 515, the positions of the several blocking rods 518 and the positions of the several receiving holes 510 correspond one by one, and the outer diameter of the blocking rod 518 matches the inner diameter of the receiving hole 510, the blocking rod 518 is used to promote the inner cavity of the receiving hole 510 to be closed, the number of the sleeve 513 is two, the two sleeves 513 are respectively arranged at the bottom end of the positioning plate 52 left and right sides, the first electromagnet 514 is arranged at the top end of the inner cavity of the sleeve 513, the number of the connecting column 516 is two, the two connecting columns 516 are respectively arranged at the top end left and right sides of the pressing plate 515, the connecting column 516 is slidably inserted into the inner cavity of the sleeve 513, the second electromagnet 517 is arranged at the top end of the connecting column 516, the second electromagnet 517 and the first electromagnet 514 are magnetically attracted, the second electromagnet 517 and the first electromagnet 514 are both electrically connected with the pressure sensor 511, the first electromagnet 514 and the second electromagnet 517 are both prior art, which will not be described here, and the cooperation between the first electromagnet 514 and the second electromagnet 517 here can promote the tablet 512 and the positioning plate 52 to be connected together.

[0042] As a preferred scheme, further, the positioning mechanism 4 comprises: a first guide rod 41, a sliding plate 42, a driving slot 43, a first clamping block 44, a support 46, a driving rod 48 and a lifting assembly, the number of the first guide rod 41 is eight, the left and right ends of the eight first guide rods 41 are arranged at the left and right sides of the four corners of the inner cavities of the two clamping cavities 3, the number of the sliding plate 42 is two, the four corners of the two sliding plates 42 are respectively slidably sleeved on the inner sides of the outer walls of the eight first guide rods 41, a plurality of front and rear through driving slots 43 are formed on the front side of the sliding plate 42 from top to bottom at equal intervals in the inclined direction, the number of the first clamping block 44 is a plurality, the plurality of first clamping blocks 44 are respectively arranged on the inner sides of the two sliding plates 42 at equal intervals in the up-down direction, the first clamping block 44 is slidably extended into the inner cavity of the mold pressing machine 1, the second clamping block 55 is matched with the first clamping block 44, the position of the positioning plate 52 can be fixed by the cooperation between the second clamping block 55 and the first clamping block 44, the outer wall of the driving rod 48 is slidably and adaptively inserted into the inner cavity of the driving slot 43, the left and right ends of the plurality of driving rods 48 are respectively arranged on the left and right sides of the inner cavity of the support 46 at equal intervals in the up-down direction, the lifting assembly is arranged at the bottom end of the inner cavity of the clamping cavity 3, and the lifting assembly can drive the support 46 to drive the driving rod 48 to move up and down.

[0043] The lifting assembly comprises: a second guide rod 45 and an electric telescopic rod 47, the number of the second guide rod 45 is four, the four second guide rods 45 are respectively arranged at the bottom ends of the inner cavities of the two clamping cavities 3, the support 46 is slidably sleeved on the outer wall of the second guide rod 45, the number of the electric telescopic rod 47 is two, the two electric telescopic rods 47 are respectively arranged at the middle portions of the bottom ends of the inner cavities of the two clamping cavities 3, the top ends of the two electric telescopic rods 47 are respectively arranged at the middle portions of the bottom ends of the two supports 46, the electric telescopic rod 47 is a prior art, and will not be described here, and the electric telescopic rod 47 is used here to push the support 46 to move up and down.

[0044] As a preferred scheme, further, the jacking mechanism 6 comprises: positioning barrels 61, support rods 62, jacking plates 63, rotating rods 64, gears 65, second hydraulic cylinders 66, lower molds 613, jacking holes 614 and jacking positioning assemblies, the number of the positioning barrels 61 is two, the two positioning barrels 61 are respectively arranged at the left and right sides of the bottom end of the inner cavity of the jacking cavity 2, the support rods 62 are slidably and adaptively inserted into the inner cavities of the positioning barrels 61, the top ends of the support rods 62 are slidably extended out of the top ends of the positioning barrels 61, the bottom ends of the jacking plates 63 are respectively arranged at the top ends of the two support rods 62, the outer walls of the rotating rods 64 are respectively rotatably arranged at the bottom end of the inner cavity of the jacking cavity 2 through bearings, the number of the gears 65 is two, the two gears 65 are respectively sleeved on the left and right sides of the outer walls of the rotating rods 64 and locked through jackscrews, the two gears 65 are respectively engaged with the two support rods 62, the left and right sides of the jacking plate 63 can be synchronously lifted by the cooperation between the gears 65 and the support rods 62, the second hydraulic cylinders 66 are arranged at the middle part of the bottom end of the inner cavity of the jacking cavity 2, the top ends of the second hydraulic cylinders 66 are arranged at the middle part of the bottom end of the jacking plate 63, the second hydraulic cylinders 66 are prior art, which will not be described here, the second hydraulic cylinders 66 are used to push the jacking plate 63 to move up and down, the lower molds 613 are arranged at the bottom end of the inner cavity of the molding machine 1, the positions of the lower molds 613 correspond to and match the positions of the upper molds 59, the top end of the lower mold 613 is provided with a plurality of jacking holes 614 which penetrate up and down, the positions of the plurality of jacking holes 614 correspond to the positions of the plurality of receiving holes 510 one by one and have the same inner diameters, the jacking plate 63 is slidably and adaptively inserted into the inner cavity of the lower mold 613, the lower mold 613 is prior art, which will not be described here, the lower mold 613 is provided with a heating device, and the jacking positioning assemblies are arranged in the inner cavity of the jacking plate 63;

[0045] The jacking positioning assembly comprises positioning needles 67, third springs 68, induction blocks 69, support frames 610, first infrared sensors 611, second infrared sensors 612, first infrared receivers 615, and second infrared receivers 616. The number of the positioning needles 67 is several. The several positioning needles 67 are equally divided into several groups. The several groups of the positioning needles 67 are respectively arranged equidistantly in the left-right direction in the inner cavity of the jacking plate 63. The several positioning needles 67 in each group are respectively arranged equidistantly in the front-rear direction in the inner cavity of the jacking plate 63. The positions of the several positioning needles 67 respectively correspond to the positions of the several jacking holes 614. The top ends of the positioning needles 67 can slide out of the top end of the jacking plate 63. The top ends of the positioning needles 67 can slide through the inner cavities of the jacking holes 614 and extend out of the top end of the lower mold 613. The outer diameter of the positioning needle 67 is the same as the outer diameter of the plugging rod 518. The positioning needle 67 is used for positioning the fiber layer of the composite material and demolding the formed composite material. The third spring 68 is sleeved on the outer wall of the positioning needle 67. The bottom end of the third spring 68 is clamped on the outer wall of the positioning needle 67. The top end of the third spring 68 is clamped on the inner cavity top end of the jacking plate 63. The third spring 68 is a rotary spring. After being extruded or stretched by external force, the third spring 68 elastically deforms. After the external force is removed, the third spring 68 returns to the initial state. The third spring 68 is used for supporting the positioning needle 67. The induction block 69 is arranged at the bottom end of the positioning needle 67. The support frame 610 is arranged at the inner cavity top end of the jacking plate 63. The several positioning needles 67 are located in the inner cavity of the support frame 610. The number of the first infrared sensors 611 is several. The several first infrared sensors 611 are respectively arranged equidistantly in the left-right direction on the front side of the inner cavity of the support frame 610. The positions of the several first infrared sensors 611 respectively correspond to the positions of the several groups of the positioning needles 67. The positions of the first infrared sensors 611 are located below the induction blocks 69. The first infrared sensors 611 are prior art, which will not be described in detail here. The number of the first infrared receivers 615 is several. The several first infrared receivers 615 are respectively arranged equidistantly in the left-right direction on the rear side of the inner cavity of the support frame 610. The positions of the several first infrared receivers 615 respectively correspond to and match the positions of the several first infrared sensors 611. The first infrared receivers 615 are prior art, which will not be described in detail here. The number of the second infrared sensors 612 is several. The several second infrared sensors 612 are respectively arranged equidistantly in the front-rear direction on the right side of the inner cavity of the support frame 610. The positions of the several second infrared sensors 612 respectively correspond to the positions of the several positioning needles 67 in each group. The positions of the second infrared sensors 612 are located below the induction blocks 69. The second infrared sensors 612 are prior art, which will not be described in detail here. The number of the second infrared receivers 616 is several. The several second infrared receivers 616 are respectively arranged equidistantly in the front-rear direction on the left side of the inner cavity of the support frame 610. The positions of the several second infrared receivers 616 respectively correspond to the positions of the several second infrared sensors 612.The second infrared receiver 616 is a prior art, which will not be described here. The cooperation between the second infrared receiver 616, the first infrared receiver 615, the second infrared sensor 612 and the first infrared sensor 611 can locate the coordinates of the composite material where the problems such as mold adhesion and fiber jamming occur.

[0046] Working principle, including the following steps:

[0047] Step one, first lay multiple layers of prepreg such as carbon fiber / epoxy resin on the top end of the lower mold 613, so that the positioning needle 67 is inserted into the natural gap of the fiber bundle or woven layer, thereby physically limiting the position of the fiber, and the upper and lower layers of fiber are aligned through the common positioning needle 67 hole, avoiding layer misalignment and ensuring that the designed angle is maintained. After the prepreg is laid, the first hydraulic cylinder 56 is started to push the pressing plate 515 downward, and the pressing plate 515 downward moves the connecting column 516 through the sleeve 513 to drive the positioning plate 52 downward, and the positioning plate 52 downward moves the positioning plate 52 downward under the gravity of the upper mold 59. At the same time, when the positioning plate 52 moves downward, the first clamping block 44 extrudes the second clamping block 55 to move into the inner cavity of the extrusion groove 53, and extrudes the first spring 54 to elastically deform, until the second clamping block 55 and the first clamping block 44 are separated, which can drive the positioning plate 52 to move downward. After the bottom end of the upper mold 59 contacts the prepreg on the top end of the lower mold 613, the positioning needle 67 is inserted into the inner cavity of the receiving hole 510, and the first hydraulic cylinder 56 continues to push the pressing plate 515 downward to drive the positioning plate 52 to move downward. Since the prepreg on the top end of the lower mold 613 blocks the upper mold 59 at this time, the positioning plate 52 moves downward to extrude the second spring 58 to elastically deform, and the second spring 58 elastically deforms to increase the pressure of the upper mold 59 on the prepreg by the elastic force of the second spring 58. At the same time, the second spring 58 pushes the pressing piece 512 upward and extrudes the pressure sensor 511, and the pressure value displayed by the pressure sensor 511 can reflect the pressure of the upper mold 59 on the prepreg. Until the upper mold 59 applies a suitable pressure value to the prepreg, the first hydraulic cylinder 56 is closed to pre-press the prepreg. At this time, the second clamping block 55 is pushed out of the inner cavity of the extrusion groove 53 by the elastic force of the first spring 54, and cooperates with the first clamping block 44 to fix the position of the positioning plate 52. At this time, the heating device of the lower mold 613 and the upper mold 59 is started to preheat the prepreg.

[0048] Step two, in the low pressure pre-pressing stage, the fiber layer is preliminarily fixed, the resin slowly infiltrates the fiber, the transverse flow shear force is reduced, the resin viscosity decreases with the temperature gradient, the flow stress is released gently, at the same time, the positioning needle 67 is used for positioning the fiber layer, so as to prevent the defects such as edge fiber distortion and interlayer slip, after pre-pressing and preheating for a period of time, the second hydraulic cylinder 66 is started to drive the lifting plate 63 to move downward, the lifting plate 63 moves downward to drive the positioning needle 67 to move downward, until the positioning needle 67 moves completely into the inner cavity of the lifting hole 614, at this time, the first electromagnet 514 and the second electromagnet 517 are closed, the magnetic property of the first electromagnet 514 and the second electromagnet 517 disappears, the first hydraulic cylinder 56 is started to continue to drive the pressing plate 515 to move downward, because the magnetic property of the first electromagnet 514 and the second electromagnet 517 disappears at this time, the pressing plate 515 moves downward and does not drive the positioning plate 52 to move downward, at the same time, because the position of the positioning plate 52 is fixed, the pressure exerted by the upper mold 59 on the prepreg can be ensured to be constant under the elastic force of the second spring 58, until the pressing plate 515 contacts the upper mold 59, at this time, the blocking rod 518 is inserted into the inner cavity of the receiving hole 510 for sealing the inner cavity of the receiving hole 510, and the first hydraulic cylinder 56 is used for exerting pressure on the pressing plate 515, so that the pressure of the pressing plate 515 is transmitted to the prepreg through the upper mold 59, and the prepreg is heated and fully pressed;

[0049] Step three, after the thermosetting resin on the prepreg is solidified, the lifting assembly is started to drive the bracket 46 to move upward, the bracket 46 moves upward to drive the driving rod 48 to move upward, the driving rod 48 moves upward and cooperates with the driving groove 43 to drive the sliding plate 42 to move outward with the first clamping block 44, until the first clamping block 44 and the second clamping block 55 are separated, so as to release the positioning of the positioning plate 52, under the elastic force of the second spring 58, the positioning plate 52 can be pushed to move upward, until the second spring 58 returns to the initial state, the first hydraulic cylinder 56 is started to drive the pressing plate 515 to move upward, until the connecting column 516 is inserted into the inner cavity of the sleeve 513, the first electromagnet 514 and the second electromagnet 517 are started, the first electromagnet 514 and the second electromagnet 517 are magnetically attracted, so that the pressing plate 515 continues to move upward to drive the positioning plate 52 to move upward through the cooperation between the connecting column 516 and the sleeve 513, the positioning plate 52 moves upward to drive the upper mold 59 to move upward through the fourth guide rod 57, until it returns to the initial position;

[0050] Step four, at this time the molded composite stringer is stored at the top of the lower mold 613, because the natural gap of the fiber bundle and the woven layer of the composite stringer at this time is filled with the solidified thermosetting resin, and then the second hydraulic cylinder 66 is started to push the lifting plate 63 to move upwards, that is, the lifting plate 63 drives the positioning needle 67 to move upwards out of the inner cavity of the lifting hole 614, and at the same time, the cooperation between the supporting rod 62 and the gear 65 ensures that the lifting plate 63 is synchronously lifted left and right, so as to ensure that the positioning needles 67 are synchronously moved, preventing the size deviation caused by the tilt of the composite stringer due to the asynchronous lifting, and even tearing the laying layer, so as to use the upwardly moving positioning needle 67 to lift the molded composite stringer stored at the top of the lower mold 613 to demold. When the composite stringer has the problems of mold adhesion and fiber jamming, the resistance applied to the corresponding positioning needle 67 will be increased, so that the corresponding positioning needle 67 will not move upwards with the lifting plate 63 as the lifting plate 63 moves upwards, so that the corresponding positioning needle 67 moves downwards compared with the lifting plate 63, and stretches the third spring 68 to be elastically deformed. Compared with the lifting plate 63, the downward movement of the corresponding positioning needle 67 drives the corresponding sensing block 69 to move downwards, and when the sensing block 69 moves to the first infrared sensor 611 and the second infrared sensor 612, the sensing block 69 will block the light of one first infrared sensor 611 and one second infrared sensor 612, respectively, so that the first infrared receiver 615 and the second infrared receiver 616 corresponding thereto cannot receive the infrared signal. At this time, the position of the composite stringer with mold adhesion and fiber jamming can be determined according to the coordinates of the sensing block 69, so that manual intervention is carried out for processing.

[0051] In summary, the device can effectively solve the defects of edge fiber distortion and interlayer slip caused by the difference between resin flow and thermal expansion coefficient in the prior art, improve the size accuracy and mechanical properties of the product, and when laying the prepreg, the positioning needle is inserted into the natural gap of the fiber bundle or the woven layer to physically limit the position of the fiber to ensure that it maintains the designed angle. At the same time, by monitoring the demolding lifting force in real time, abnormal stress state can be identified and adjusted in time to avoid micro-cracks and breakage caused by mold adhesion or fiber jamming, thereby greatly reducing the scrap rate. The mold system can realize precise control of the hot pressing process and safety protection of the demolding process, and is especially suitable for the molding needs of high-precision and high-performance composite stringers in the fields of aerospace and the like, and has significant economic benefits and application value.

[0052] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite material long stringer forming mold, characterized in that: include: A molding machine (1), wherein a lifting cavity (2) is provided at the bottom end of the inner cavity of the molding machine (1), and a positioning cavity (3) communicating with the inner cavity of the molding machine (1) is provided on both the left and right sides. A positioning mechanism (4), the positioning mechanism (4) being arranged in the inner cavity of the positioning cavity (3); A molding mechanism (5), the molding mechanism (5) being arranged at the top end of the inner cavity of the molding machine (1); A lifting mechanism (6), wherein the lifting mechanism (6) is arranged in the inner cavity of the lifting cavity (2); The molding mechanism (5) comprises: Third guide rods (51), the number of the third guide rods (51) is four, and the upper and lower ends of the four third guide rods (51) are respectively arranged at the four corners of the upper and lower sides of the inner cavity of the molding machine (1); A positioning plate (52), wherein the four corners of the positioning plate (52) are respectively slidably adapted to be matched with the top ends of the outer walls of the four third guide rods (51), and a plurality of extrusion grooves (53) are provided on both the left and right sides of the positioning plate (52); A clamping assembly, the clamping assembly being arranged in the inner cavity of the extrusion groove (53), and being able to fix the position of the positioning plate (52) by cooperating with the clamping assembly and the positioning mechanism (4); A fourth guide rod (57), wherein the number of the fourth guide rods (57) is several, and the outer wall tops of the several fourth guide rods (57) are respectively and equally slidably adapted to be plugged into the left and right sides of the positioning plate (52); An upper mold (59), wherein the left and right sides of the top of the upper mold (59) are respectively arranged at the bottom ends of a plurality of fourth guide rods (57), and a plurality of receiving holes (510) are opened at the top of the upper mold (59); A pre-pressing assembly, the pre-pressing assembly being slidably sleeved on the outer wall of the fourth guide rod (57); A full-pressure assembly, the full-pressure assembly being slidably sleeved on the outer wall of the fourth guide rod (57); The pre-pressing assembly comprises: a pressure sensor (511), the number of the pressure sensors (511) being several, the pressure sensors (511) being equally arranged on the left and right sides of the bottom end of the positioning plate (52), and the pressure sensors (511) being slidably sleeved on the outer wall of the fourth guide rod (57); The full pressure assembly includes: a first hydraulic cylinder (56), wherein the number of the first hydraulic cylinders (56) is plural, and the plurality of the first hydraulic cylinders (56) are respectively arranged at the top of the molding machine (1) at equal intervals along the left and right directions, and the bottom end of the first hydraulic cylinder (56) extends into the inner cavity of the molding machine (1), and the positioning plate (52) is slidably sleeved on the outer wall of the first hydraulic cylinder (56); A pressure plate (515), wherein the left and right sides of the pressure plate (515) are respectively slidably sleeved on the outer walls of the plurality of fourth guide rods (57), and the bottom end of the first hydraulic cylinder (56) is arranged on the top end of the pressure plate (515); A plurality of blocking rods (518), each of which is provided at the bottom end of the pressure plate (515), wherein the positions of the blocking rods (518) correspond to the positions of the receiving holes (510), and the outer diameter of the blocking rods (518) matches the inner diameter of the receiving holes (510); Sleeves (513), the number of the sleeves (513) is two, and the two sleeves (513) are respectively arranged on the left and right sides of the bottom end of the positioning plate (52); a first electromagnet (514), the first electromagnet (514) being arranged at the top end of the inner cavity of the sleeve (513); Connecting columns (516), the number of the connecting columns (516) is two, and the two connecting columns (516) are respectively arranged on the left and right sides of the top of the pressure plate (515), and the connecting columns (516) can be slidably inserted into the inner cavity of the sleeve (513); A second electromagnet (517) is provided at the top of the connecting column (516), the second electromagnet (517) and the first electromagnet (514) are magnetically attracted to each other, and the second electromagnet (517) and the first electromagnet (514) are both electrically connected to the pressure sensor (511).

2. A composite material long stringer forming mold according to claim 1, characterized in that: The clamping assembly comprises: a first spring (54), the first spring (54) being embedded in the inner cavity of the extrusion groove (53), and one end of the first spring (54) being clamped to the inner wall of the extrusion groove (53); A second clamping block (55), a portion of which is slidably embedded in the inner cavity of the extrusion groove (53), and another portion of which is slidably extended out of the inner cavity of the extrusion groove (53), and the other end of the first spring (54) is clamped to the outer wall of the second clamping block (55).

3. A composite material long stringer forming mold according to claim 2, characterized in that: The pre-pressing assembly further comprises: A pressing piece (512), the pressing piece (512) is slidably sleeved on the outer wall of the fourth guide rod (57), and the top end of the pressing piece (512) is in contact with the bottom end of the pressure sensor (511); A second spring (58), wherein the second spring (58) is sleeved on the outer wall of the fourth guide rod (57), one end of the second spring (58) is clamped on the outer wall of the fourth guide rod (57), and the other end of the second spring (58) is clamped on the bottom end of the pressing plate (512).

4. A composite material long stringer forming mold according to claim 3, characterized in that: The positioning mechanism (4) comprises: First guide rods (41), the number of the first guide rods (41) is eight, and the left and right ends of the eight first guide rods (41) are respectively arranged at the four corners on the left and right sides of the inner cavities of the two positioning cavities (3); Slide plates (42), the number of the slide plates (42) is two, the four corners of the two slide plates (42) are slidably sleeved on the inner sides of the outer walls of the eight first guide rods (41), and the front side of the slide plates (42) is provided with a plurality of driving grooves (43) extending front to back and equidistantly from top to bottom along an inclined direction; A first card block (44), wherein the number of the first card blocks (44) is plural, and the first card blocks (44) are equidistantly arranged on the inner sides of the two slides (42) in the vertical direction, the first card blocks (44) are slidably extended into the inner cavity of the molding machine (1), and the second card block (55) matches the first card block (44); A driving rod (48), wherein the middle portion of the outer wall of the driving rod (48) is slidably adapted to be inserted into the outer side of the inner cavity of the driving groove (43); A bracket (46), wherein the left and right ends of the plurality of driving rods (48) are respectively arranged at equal distances in the vertical direction on the left and right sides of the inner cavity of the bracket (46); A lifting assembly is provided at the bottom end of the inner cavity of the positioning cavity (3). The lifting assembly can be used to drive the bracket (46) to drive the driving rod (48) to move up and down.

5. The composite material long stringer forming mold according to claim 4, characterized in that: The lifting mechanism (6) comprises: Positioning cylinders (61), the number of the positioning cylinders (61) is two, and the two positioning cylinders (61) are respectively arranged on the left and right sides of the bottom end of the inner cavity of the jacking cavity (2); A support rod (62), the support rod (62) is slidably adapted to be inserted into the inner cavity of the positioning cylinder (61), and the top end of the support rod (62) is slidably extended out of the top end of the positioning cylinder (61); A lifting plate (63), wherein the left and right sides of the bottom end of the lifting plate (63) are respectively arranged at the top ends of the two support rods (62); A rotating rod (64), wherein the left and right sides of the outer wall of the rotating rod (64) are rotatably arranged at the bottom end of the inner cavity of the lifting cavity (2) via bearings; Gear (65), the number of the gears (65) is two, the two gears (65) are respectively sleeved on the left and right sides of the outer wall of the rotating rod (64), and are locked by a top screw, and the two gears (65) are respectively engaged with the two support rods (62); a second hydraulic cylinder (66), the second hydraulic cylinder (66) being arranged at the middle of the bottom end of the inner cavity of the jacking cavity (2), and the top end of the second hydraulic cylinder (66) being arranged at the middle of the bottom end of the jacking plate (63); A lower mold (613), the lower mold (613) is arranged at the bottom end of the inner cavity of the molding machine (1), the position of the lower mold (613) corresponds to and matches the position of the upper mold (59), the top of the lower mold (613) is provided with a plurality of jacking holes (614) running through the upper and lower parts, the positions of the plurality of jacking holes (614) correspond to the positions of the plurality of receiving holes (510) one by one, and the inner diameters are the same, and the jacking plate (63) can be slidably adapted and plugged into the inner cavity of the lower mold (613); A lifting and positioning component is provided in the inner cavity of the lifting plate (63).

6. The composite material long stringer forming mold according to claim 5, characterized in that: The lifting and positioning assembly includes: Positioning needles (67), the number of the positioning needles (67) is several, and the positioning needles (67) are equally divided into several groups, and the positioning needles (67) in the several groups are respectively arranged in the inner cavity of the lifting plate (63) at equal distances along the left and right directions, and the positioning needles (67) in each group are respectively arranged in the inner cavity of the lifting plate (63) at equal distances along the front and back directions, and the positions of the positioning needles (67) correspond to the positions of the lifting holes (614) one by one, and the top end of the positioning needle (67) can be slidably extended out of the top end of the lifting plate (63), and the top end of the positioning needle (67) can be slidably passed through the inner cavity of the lifting hole (614) and extended out of the top end of the lower mold (613), and the outer diameter of the positioning needle (67) is the same as the outer diameter of the blocking rod (518); a third spring (68), wherein the third spring (68) is sleeved on the outer wall of the positioning needle (67), the bottom end of the third spring (68) is clamped on the outer wall of the positioning needle (67), and the top end of the third spring (68) is clamped on the top end of the inner cavity of the lifting plate (63); A sensing block (69), wherein the sensing block (69) is arranged at the bottom end of the positioning needle (67); A support frame (610), wherein the support frame (610) is arranged at the top end of the inner cavity of the lifting plate (63), and the plurality of positioning pins (67) are all located in the inner cavity of the support frame (610); a first infrared sensor (611), wherein the number of the first infrared sensors (611) is several, and the several first infrared sensors (611) are respectively arranged at equal distances along the left and right directions on the front side of the inner cavity of the support frame (610), and the positions of the several first infrared sensors (611) correspond one-to-one to the positions of the several groups of positioning pins (67), and the position of the first infrared sensor (611) is located below the sensing block (69); a first infrared receiver (615), wherein the number of the first infrared receivers (615) is plural, and the first infrared receivers (615) are equidistantly arranged on the rear side of the inner cavity of the support frame (610) along the left-right direction, and the positions of the first infrared receivers (615) correspond to and match the positions of the first infrared sensors (611); A second infrared sensor (612), wherein the number of the second infrared sensors (612) is several, and the several second infrared sensors (612) are respectively arranged at equal distances along the front-back direction on the right side of the inner cavity of the support frame (610), and the positions of the several second infrared sensors (612) correspond one-to-one to the positions of the several positioning pins (67) in each group, and the position of the second infrared sensor (612) is located below the sensing block (69); A second infrared receiver (616), the number of the second infrared receivers (616) is several, and the several second infrared receivers (616) are respectively arranged at equal distances along the front-to-back direction on the left side of the inner cavity of the support frame (610), and the positions of the several second infrared receivers (616) correspond one-to-one to the positions of the several second infrared sensors (612) and match each other.

7. A composite material long stringer forming method, which is applied to a composite material long stringer forming mold according to claim 6, characterized in that: The following steps are involved: Step 1: First, lay multiple layers of prepreg on the top of the lower mold (613), prompting the positioning pin (67) to be inserted into the natural gap of the fiber bundle or the braided layer, thereby physically limiting the position of the fiber, and aligning the upper and lower layers of fibers through the shared positioning pin (67) hole. After the prepreg is laid, start the first hydraulic cylinder (56), and use the first hydraulic cylinder (56) to push the pressure plate (515) downward. The pressure plate (515) moves downward and uses the cooperation between the first electromagnet (514) and the second electromagnet (517) to prompt the connecting column (516) to drive the positioning plate (52) through the sleeve (513). ) moves downward, the positioning plate (52) moves downward by the gravity of the upper mold (59) itself. At the same time, when the positioning plate (52) moves downward, the first clamping block (44) is used to squeeze the second clamping block (55) to move toward the inner cavity of the extrusion groove (53), and squeeze the first spring (54) to elastically deform until the second clamping block (55) and the first clamping block (44) are separated, which can prompt the positioning plate (52) to move downward. After the bottom end of the upper mold (59) contacts the prepreg at the top end of the lower mold (613), the positioning pin (67) is inserted into the inner cavity of the receiving hole (510). The first hydraulic cylinder (56) continues to push the pressing plate (515) downward, thereby driving the positioning plate (52) to move downward. At this time, the prepreg at the top of the lower mold (613) is used to block the upper mold (59), and then the positioning plate (52) moves downward to squeeze the second spring (58) to undergo elastic deformation. When the second spring (58) undergoes elastic deformation, the elastic force of the second spring (58) can be used to increase the pressure applied by the upper mold (59) to the prepreg. At the same time, the elastic force of the second spring (58) is used to push the pressing plate (512) upward and squeeze the pressure sensor (511). ), by reading the value displayed by the pressure sensor (511), the pressure applied by the upper mold (59) to the prepreg can be reflected, until the upper mold (59) applies a suitable pressure value to the prepreg, and the first hydraulic cylinder (56) is closed to pre-press the prepreg. At this time, under the elastic force of the first spring (54), the second clamping block (55) can be pushed to move out of the inner cavity of the extrusion groove (53) and cooperate with the first clamping block (44) to fix the position of the positioning plate (52). At this time, the heating devices of the lower mold (613) and the upper mold (59) are started to preheat the prepreg; Step 2: During the low-pressure pre-pressing stage, the fiber layer is initially fixed, the resin slowly infiltrates the fiber, the lateral flow shear force is reduced, the resin viscosity decreases with the temperature gradient, and the flow stress is gently released. At the same time, the fiber layer is positioned using the positioning needle (67). After a period of pre-pressing and preheating, the second hydraulic cylinder (66) is started to drive the lifting plate (63) to move downward. The downward movement of the lifting plate (63) can drive the positioning needle (67) to move downward until the positioning needle (67) is completely moved into the inner cavity of the lifting hole (614). At this time, the first electromagnet (514) and the second electromagnet (517) are turned off, the magnetism of the first electromagnet (514) and the second electromagnet (517) disappears, and the first hydraulic cylinder (56) is started to continue to push the pressing plate (515) downward. Move, because the magnetism of the first electromagnet (514) and the second electromagnet (517) disappears at this time, and the downward movement of the pressing plate (515) does not drive the positioning plate (52) to move downward. At the same time, because the position of the positioning plate (52) is fixed, the elastic force of the second spring (58) can ensure that the pressure applied by the upper mold (59) to the prepreg is constant until the pressing plate (515) contacts the upper mold (59). At this time, the blocking rod (518) is inserted into the inner cavity of the receiving hole (510) to block the inner cavity of the receiving hole (510), and the first hydraulic cylinder (56) is used to apply pressure to the pressing plate (515), so that the pressure of the pressing plate (515) is transmitted to the prepreg through the upper mold (59), thereby heating and fully pressing the prepreg; Step 3: After the thermosetting resin on the prepreg is solidified, the lifting assembly is started to drive the bracket (46) to move upward, and the bracket (46) moves upward to drive the driving rod (48) to move upward. The driving rod (48) moves upward and cooperates with the driving groove (43) to prompt the slide (42) to drive the first block (44) to move outward until the first block (44) and the second block (55) are separated, thereby releasing the positioning of the positioning plate (52). Under the elastic force of the second spring (58), the positioning plate (52) can be pushed to move upward until the second spring (58) returns to its initial state, and the lifting assembly is started. The first hydraulic cylinder (56) drives the pressing plate (515) to move upward until the connecting column (516) is inserted into the inner cavity of the sleeve (513), and the first electromagnet (514) and the second electromagnet (517) are activated. The first electromagnet (514) and the second electromagnet (517) are magnetically attracted to each other, so that the pressing plate (515) continues to move upward, and the positioning plate (52) can be driven to move upward by the cooperation between the connecting column (516) and the sleeve (513). When the positioning plate (52) moves upward, the fourth guide rod (57) can be used to drive the upper mold (59) to move upward until it returns to its initial position. Step 4: At this time, the composite material long stringer after compression molding is stored at the top of the lower mold (613). Since the natural gaps between the fiber bundles and the braided layer of the composite material long stringer are filled with solidified thermosetting resin at this time, the second hydraulic cylinder (66) is started to push the lifting plate (63) to move upward, and the lifting plate (63) can be used to drive the positioning pins (67) to move upward out of the inner cavity of the lifting hole (614). At the same time, the cooperation between the support rod (62) and the gear (65) is used to ensure that the lifting plate (63) rises synchronously on the left and right, thereby ensuring that several positioning pins (67) move synchronously, and thus the upwardly moving positioning pins (67) are used to lift and demould the composite material long stringer after molding stored at the top of the lower mold (613). When there are problems of mold adhesion and fiber jamming in the composite material long stringer, the resistance applied by the positioning pins (67) at the corresponding points will be increased, so that as the lifting plate (63) moves upward, the corresponding points will be prompted to move upward. The positioning pin (67) at the corresponding position will not move upward with the lifting plate (63), so that the positioning pin (67) at the corresponding point moves downward compared to the lifting plate (63) and stretches the third spring (68) to undergo elastic deformation. The positioning pin (67) at the corresponding point moves downward compared to the lifting plate (63), which can drive the corresponding sensing block (69) to move downward. When the sensing block (69) moves to the first infrared sensor (611) and the second infrared sensor (612), the sensing block (69) is used to block the light of the first infrared sensor (611) and the light of the second infrared sensor (612), respectively, so that the first infrared receiver (615) and the second infrared receiver (616) corresponding to them cannot receive the infrared signal. At this time, the position where the composite material long stringer has mold adhesion and fiber jamming can be judged according to the coordinates of the sensing block (69), so that manual intervention is performed to deal with it.

Images